open-TestChatApp-iOS/Chat/UI/ChatList/ChatListViewModel.swift

//
//  ChatListViewModel.swift
//  Chat
//
//  Created by Sergey Tarasov on 25.07.2022.
//

import Foundation
import XMPPFramework
import XMPPFrameworkSwift

final class ChatListViewModel: NSObject, ObservableObject {
	let manager = XMPPController.shared

    @Published var users: [User] = []

    var nicknames: [String] {
        return users.map({ $0.nickname.isEmpty ? $0.jidString : $0.nickname })
    }

    var timer: Timer?

    override init() {
		super.init()
		self.timer = Timer(timeInterval: 2, repeats: true, block: { [weak self] timer in
			self?.fetchChatList()
			if !(self?.users.isEmpty ?? true) {
				timer.invalidate()
			}
		})
    }

    public func fetchChatList() {
		let xmppUsers = manager.xmppRosterStorage.sortedUsersByAvailabilityName() as? [XMPPUser]
		guard let users = xmppUsers?.compactMap({ User(jidString: $0.jid.bare, nickname: $0.nickname) }) else {
			return
		}
		self.users = users
    }
}